Magnetic separator.



C. M. GREEN. MAKGNETIU SEPARATOR. APPLICATION FILED 122 .10, 1904.

910,664. Patented Jan. 26, 1909.

2 SHEETS-SHEET 1. g-'- Chafles MGreeri G. M GREEN.

MAGNETIC SEPARATOR. APPLICATION FILED D EG.10,1904.

Patented Jan. '26, 1909.

2 SHEETS-SHEET 2.

- I Inventor; ChaHS M. Gregn',

Oqtty 'Witnesses:

p srArns PATENT orrron CHARLES M. GREEN, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK,

MAeNE'rIG s'EPAnA'ron. .1

' Patented 19.11.26, 1909.

ticles from granular or pulverized mixtures containing both magnetld and non-magnetic substances.

The object of my invention is to provide a simple and cheaply manufactured magnetic separator which will operate rapidly andeffectually to remove all the magnetic articles, even those feeblest magnetic, cm

mixtures containing the same.

In carrying out my invention 1 mount upon a suitable frame a hopper for receiving the granular mass, and having. .at its lower end means for discharging the mass in a uni;

corner 'posts 2 conneeted at the ends of the frame by horizontal bars 3, 4, and at each side of the frame by bars 5; and the tops of form stream to the operation of the separating devices, and below the latter are arranged suitable receptacles for containing the separated iarticles. The separating means consists 0' two massive iron rollers journaled in the'frame horizontally and provided at their ends with extensions which serve as cores for the magnetic exciting coils, and their peripheries are provided with regularlyspaced longitudinal teeth or wedge-shaped projections.

The rolls are caused to rotate in unison by providing .them with intermeshing gears or otherwise so that in the the teeth or projections 0 one roll will overlap the teeth or projections of the other roll without contacting. The function of these teeth or projections is to cause a rolling or stirring of the mass as it falls between the rolls and to concentrate the magnetic lines of force which issue from the periphery of one roll, traverse the intervening space and enter the periphery of the other roll, so that the action of the lines of force is rendered more intense and consequently effective to impel all the magnetic particles including the feeblest magnetic to the teeth or. projections of the rolls. As the teeth or rejections move away from the magnetic fielil between the rolls, the particles collected thereby during the passage through the field drop off into the receptacles provided therefor; while lane of their axes the non-magnetic particles being uninfluenced by the magnetic field pass vertically from'the lowermost ofthe overlappin teeth or projections of the rolls and are'caug t in a separate receptacle.

For a more complete understanding of my invention reference may-be had-to the'follo-w ing detailed description and the accompanying drawing forming a part of this specification, in which- Figure l is a side elevation with parts broken away showing a magnetic separator embodying one form of'myinvention; Fig. 2 is a top plan withpartfin section of the same; Fig. 3 is a vertical section in a plane at'right angles to the axes of the rotating parts; and Fig. 4 is a-fragmentary view of the rolls indicating the assumed arrangement of the magnetic lines of force issuing from'or converging toward the teeth or projections thereof. r

The frame of'the device consists of sills 1,

the corner posts are connected by a plate 6.

by sheathing 7 discharges from the hopper and thereby causing it to engage a greater portion of the. periphery of the magnetic separating means,

as indicated in Fig. 3. .Beneath the separating means is arranged an inverted V- shaped box 15 Wit/b. 811 opening at its upper end through which the non-magnetic particles may fall while the inclined sides receive the deflected particles of magnetic materiaL.

The se arating means com rise two horizontal'rol ls 16, 17 with reduce journals 18 at their-ends engaging bearings '19 on the horizontal bars 5 of the frame. The middle portions 20v of the rolls are of relatively large Extending across the top opening and The front slde of the frame may be 1nclosed diameter-and of a length equal to about onenally grooved to form teeth or projections 22 which are preferably made with one side radial and the other side chordal, as indi- I cated in -F' .;.4, so that downwardly-inclined .sur'faceswill"bepresented to the granular with a small s rocket wheel whi applied to drive the rolls.

mass asJitpasseshetween the rolls to prevent the Iparticles from being mechanically held by-t erolls. The ends of the rolls 16,

17 have at one end intermeshing gears 23- which are fixed thereto in such positions that the teeth orprojections22 may overla' as. they pass the plane of the axes-of the r0 s without contact' i The 'ournals 18, of the roll 16 is extende b'eyon' the gear 23 and provided with a pulley 24 by which power is The corresponding journal on the other roll 17 is provided 0 is connected by a rive'chain 26 with a similar wheel 27 on the end of the distributing roller 13 to transmit motion 'to the latter. In order to protect the gears '23, sprockets 25", 27

and chain-26, from grit, they are covered by a sheet metal casing. 28'secured by screws to the sheathing at the side of the frame. a

The means for providing a magnetic field in the space between the middle portions 20 of the rolls consists in providingthe respece tive reduced portions 21 of one roll with oppositely-wound coils 29 of electric conductor so disposed that upon the passage""'of current therethrough a positive consequent pole will be induce the roll, and providing the respective repositely-wound coils 29 of electric, conductors so disposed that upon the passage of current therethrough a negative consequent pole will be induced in the middle portion of that roll, and by reason of the magnetic lines of force seekin the paths ofleast resistance they will pass from the positive to the nega tive pole across the space betwee'nthe adj acent surfaces of the rolls. In order to insure the suppression of the magnetic lines of force on the non-adj acent surfaces of the rolls to therel'y prevent any particles adhering after the teeth or projections have v passed the lowermost pointsof their paths, provide shields 30 of magnetic material Which surround the remote halves of the central portions 20 of the rolls and support them from the end bars 3, 4 of the frame. The coils 29 on each roll are connected with each other and with contact rings 31 at the end of the roll by wires extending through the axis of .the' arrows in 'F' in the middle portion of iii the roll as indicatedin dotted lines in' 1. Theoperatioiiiof the separator above described is as follows: Current having been turned on to the exciting coils 29. and the rolls 16, {Z paused to'rotate in the direction N 3, the hopper is supp liedwith the gran ar or powdered mixture. he mixture oil-coming in contact with the roller'13 is deflected sidewise so as to fall into contact with the 11 'per portionsof the roll sections 20 when. thleumagnetiofield is-relativel feeble, but {as it slides. down over the slow y revolvin teeth or rejections 22 it is caused .to tum'b epovenanll over,'-. and 'atthe same .time the strength -'of the field increases until. the planeof theL-axis isia preached :j where the mixture issubjectedto th m contact alternately with the'teie 22 on the opposite rolls. Moreover; on account of the concentrationfof the magnetic" linesof: force at the edges of the teeth every particle of. the 1 granular-substance which is ma etic even to the smallest degree is cause to attach itself and adherev to one .or theother roll it is carried out of the magnetic field of force when it is allowed to drop off into the compartment provided therefor; while the non-magnetic particles are'allowed to fall perpendicularl from theyteethjust below the plane-of t e axes of. the rolls into their se arate compartments 1'5,

I do not. desire to restrict myself to the articular form or arrangement of parts herein described and'shown', since it is a parent that they may be changed and mo ied without departmgyfrom'my invention.

' What I claim as new, and desire to sechr'e by Letters Patent of the United States, is, duced portions 21 of the other roll with op- 1. In a' magnetic separator, the combina-} tion of two magnetic rolls ha peri heral I teeth-extending lon itudinally thereo ,and intermeshing gears ed to said rolls and so 7 dis osed that the respective teethon each ro will enter the s aces between-the teeth- 1 of the other roll without contacting.

-2. Ina-magnetic separator, the combination of two parallel. ma netic rollsihaving .per'ipheral teeth .exten ing-longitudinally thereof, ,each tooth being wedge shaped and inclined downward relative to theffield of force between the rolls,.'and means for-rotating said rolls in unison with thesaid teeth out of 'contact. f

In witness whereof I have hereunto. set' my hand this 8th day o f-December, 19041 1 CHARLES M.- GREEN; Witnesses':- I

JOHN A; MolllanuaJn, I DUGALD McK. MOKILLOP.

e strong, 80 est field and violently agitated b coming 

